** Archived Article - please check for current information. **
July 16, 2012
Longleaf pine trees shedding needles is normal this time of year
Some longleaf pine trees are shedding their needles across the sandhills and coastal plain, a normal occurrence this time of year, according to the S.C. Department of Natural Resources.
Many folks become alarmed when they see brown needles on longleaf pines, since the trees are, after all, classified as evergreen. But the term evergreen can be a bit misleading. Although longleaf does retain needles year-round, in years with abundant rainfall, individual bundles of needles generally remain on the tree for two growing seasons, and are shed in the fall. But in drought years, longleaf pines sometimes shed needles as early as July. That is what we are seeing now in areas that have not received much rain.
The two-year-old needles on longleaf pine trees are closer to the base of the branches than the younger needles, and so one easy way to tell if browning needles are a cause for concern or not is to note where they are found on the branch. If needles are browning at the base of branches, then likely this is a normal response to drought. By dropping needles early, the tree reduces its need for water. Wilting of leaves in many other plants is a similar response to drought, but differs in that the leaves remain on the plant. By wilting, the leaves expose less surface to the sun and wind and so the plant requires less water. If the stress is not too severe or of too long duration, wilted leaves can recover when the plant receives additional water. But browned needles do not reverse to green. If the needles are browning at the extreme ends of the branches, the problem might be something other than drought stress.
Johnny Stowe, S.C. Department of Natural Resources (DNR) forester and wildlife biologist, said trees are efficient at taking up, conserving and recycling nutrients. A high percentage of the nitrogen and phosphorus in pine needles moves back into the tree before the needles turn brown and fall off. Nutrients such as calcium and magnesium do not translocate when needles shed. Consequently, these nutrients are lost from the site in substantial quantities when straw is raked on a regular basis. In those situations, it is beneficial to fertilize occasionally to offset the loss of nutrients, especially on poor land where longleaf pine often grows. Individual trees of the same species may drop needles a few weeks apart. Trees on dry sites tend to drop needles earlier than trees on wetter sites.
Other species of Southern pines, such as loblolly pine, tend to react similarly to drought, although longleaf tolerates dry weather best of all. Besides being more drought-resistant as compared to other Southern pines, longleaf is also less susceptible to damage from wind, fire, insects and diseases.
Find out more at the Longleaf Alliance.
- S.C. Natural Resources Board meets July 25 at Edisto Island State Park
- Fourth round results reported from S.C. Governor’s Cup Billfishing Series
- Drought status maintained for all counties except Barnwell
- South Carolina Conservation Bank Board to meet July 24 in Columbia
- Flood insurance community meeting set Aug. 2 in Florence
- DNR to host series of alligator hunting seminars
- SC Drought Response Committee conference call on July 19
- Third Round Results from the SC Governor’s Cup Billfishing Series
- Aug. 10 is deadline to apply for opening day Youth Draw Dove Hunts
- Aug. 10 is deadline to apply for Limited Entry Dove Hunts
- New fishing agreement between Georgia, South Carolina took effect July 1
- DNR courtesy boating inspections continue through July 4 holiday
- State wildlife, fisheries group meets July 11 at Table Rock State Park
- Waterfowl Advisory Committee meets July 10 in Columbia
- New DNR website on in-water sea turtle research activities
- Plant fields now for fall mourning dove hunts
- Video - Drink. Drive. Die?
- DNR continues to add fishing clinics around the state
- Freshwater fishing trends
- Saltwater fishing trends
- S.C. weekly tidetable
- DNR video